Congrats on your move! Decorating 'from scratch' is lots of fun but can easily get overwhelming :). We moved from a small apartment to a 3 story home few months ago and it's still work in progress.. My big and long living room is slowly being taken over by toys as well.. They seem to multiply faster than rabbits :O. I utilized the bottom 2 shelves of a plain white bookcase (Billy from Ikea), I put two of Target brown fabric bins at the bottom (filled with stuffed animals and lighter plastic 'junk') and a few books and 2 smaller rattan baskets filled with blocks and small dollhouse accessories on the next shelf. The rest of bookcase is my books and picture frames (it's great to hide eg markers and playdough and paint behind the books too ;)). I'm also planning to get a cube storage unit (Expedit from Ikea too), it's deeper than the bookcase and doesn't scream 'kids', I'll put her toys into bins or baskets so they're not out in the open... When she grows, I can always fill it with books, games, knicknacks like frames and vases as well...

Oops. I forgot to state the game plan. I am trying to come up with an arrangement for art work to go over the bed. Since I am creating or buying specifically for this space I am open to size, shape and placement. The 2' square painting is the only thing I have so far, but I could use it somewhere else. I am looking for a creative arrangement and would not be opposed to something unusual or dramatic. I like mirrors, vintage tin ceiling panels, wreaths, architectural pieces, signage, and paintings, as long as the objects are arranged with balance and visual interest. I will paint any paintings, which is why I am open to size. I also work with clay and was thinking of creating textured tiles or panels to hang on the wall. The curved headboard has me a little stumped. This is the painting that I have that could be used:

https://www.benjaminmoore.com/en-ca/colour-overview/find-your-colour/colour/hc-132/harrisburg-green?source=%2Fen-ca%2Fcolour-overview%2Ffind-your-colour%2Fcolour-families%2Fgre%2Fgreen&color=HC-132 https://www.benjaminmoore.com/en-ca/colour-overview/find-your-colour/colour/701/swept-away?color=701&source=%2Fen-ca%2Fcolour-overview%2Ffind-your-colour%2Fcolour-families%2Fgre%2Fgreen https://www.benjaminmoore.com/en-ca/colour-overview/find-your-colour/colour/600/medici-malachite?color=600&source=%2Fen-ca%2Fcolour-overview%2Ffind-your-colour%2Fcolour-families%2Fgre%2Fgreen

the furniture is very dark and heavy, I would keep thhe space very light. It's a basement, you don't want it to feel like a dungeon. I would stay away from cute, it won't be a playroom forever. ... an accent color for the Fireplace wall would be appropriate. What's your favorite color? You want to LOVE going into that space for it to be successful. Lighting is the most important part of designing any space, don't skimp.