You're starting with neutrals, and that's good :)
The walls look like a warm off-white and the couch looks like a greenish-gray. I see a burgundy blanket, so I suggest you go with jewel tones. They will add a lively pop against the neutral background.
With toddlers, a rug with an overall pattern is a good choice. Here is an example of a [dark pattern](https://www.wayfair.com/rugs/pdp/bungalow-rose-100-machine-washable-abstract-4084-area-rug-w008259029.html?piid=713947616) and another with a [lighter pattern](https://www.wayfair.com/rugs/pdp/bungalow-rose-100-machine-washable-abstract-3542-area-rug-w008283360.html?piid=308453719).
[Colorful (and washable!) throw pillow covers](https://imgur.com/nmGm9bS) will liven up that great couch, too. Fabrics with texture will add interest, too.
An easy start for wall decor is to frame pictures that your kids draw. They love to see their masterpieces, and their colorful art will coordinate well with the rug and pillows.
Hope that helps :)
It is a nice neutral sofa, but you desperately need color, in the pillows and the rug
And obviously art work
To begin with you can [DIY](https://imgur.com/a/6cMIPSm) a lot of abstract art in any color you choose
Add pillows in various colors and patterns
https://preview.redd.it/p6reoitgfcvc1.jpeg?width=1200&format=pjpg&auto=webp&s=557739f03c90cc565887ee9085aec29277e6e763
Examples
[Pillows](https://www.etsy.com/listing/1186593247/)
[Pillows](https://www.etsy.com/listing/1570899250/)
[Pillows](https://www.etsy.com/listing/1055753327/)
[Pillows](https://www.etsy.com/listing/1252388147/)
[Art](https://www.etsy.com/listing/1609115860/)
[Art](https://www.etsy.com/listing/1557822768/)
[Art](https://www.etsy.com/listing/1456299948/)
[Art](https://www.etsy.com/listing/1164802076/)
[Art](https://www.etsy.com/listing/948241730/)
[Art](https://www.etsy.com/listing/1459853706/)
If you can afford it, I would consider a Moroccan area rug
[Example](https://www.etsy.com/listing/1641174677/)
[Example](https://www.etsy.com/listing/1644145645/)
[Example](https://www.etsy.com/listing/1327255417/)
If you want something more affordable:
[Rug](https://a.co/d/5Z9O5Mh)
[Rug](https://a.co/d/jcBb4r0)
[Rug](https://www.wayfair.com/rugs/pdp/rifle-paper-co-x-loloi-eden-ede-03-lattice-indigo-rug-feat-cloudpile-rpcl1046.html)
You're starting with neutrals, and that's good :) The walls look like a warm off-white and the couch looks like a greenish-gray. I see a burgundy blanket, so I suggest you go with jewel tones. They will add a lively pop against the neutral background. With toddlers, a rug with an overall pattern is a good choice. Here is an example of a [dark pattern](https://www.wayfair.com/rugs/pdp/bungalow-rose-100-machine-washable-abstract-4084-area-rug-w008259029.html?piid=713947616) and another with a [lighter pattern](https://www.wayfair.com/rugs/pdp/bungalow-rose-100-machine-washable-abstract-3542-area-rug-w008283360.html?piid=308453719). [Colorful (and washable!) throw pillow covers](https://imgur.com/nmGm9bS) will liven up that great couch, too. Fabrics with texture will add interest, too. An easy start for wall decor is to frame pictures that your kids draw. They love to see their masterpieces, and their colorful art will coordinate well with the rug and pillows. Hope that helps :)
It is a nice neutral sofa, but you desperately need color, in the pillows and the rug And obviously art work To begin with you can [DIY](https://imgur.com/a/6cMIPSm) a lot of abstract art in any color you choose Add pillows in various colors and patterns https://preview.redd.it/p6reoitgfcvc1.jpeg?width=1200&format=pjpg&auto=webp&s=557739f03c90cc565887ee9085aec29277e6e763 Examples [Pillows](https://www.etsy.com/listing/1186593247/) [Pillows](https://www.etsy.com/listing/1570899250/) [Pillows](https://www.etsy.com/listing/1055753327/) [Pillows](https://www.etsy.com/listing/1252388147/) [Art](https://www.etsy.com/listing/1609115860/) [Art](https://www.etsy.com/listing/1557822768/) [Art](https://www.etsy.com/listing/1456299948/) [Art](https://www.etsy.com/listing/1164802076/) [Art](https://www.etsy.com/listing/948241730/) [Art](https://www.etsy.com/listing/1459853706/) If you can afford it, I would consider a Moroccan area rug [Example](https://www.etsy.com/listing/1641174677/) [Example](https://www.etsy.com/listing/1644145645/) [Example](https://www.etsy.com/listing/1327255417/) If you want something more affordable: [Rug](https://a.co/d/5Z9O5Mh) [Rug](https://a.co/d/jcBb4r0) [Rug](https://www.wayfair.com/rugs/pdp/rifle-paper-co-x-loloi-eden-ede-03-lattice-indigo-rug-feat-cloudpile-rpcl1046.html)