I have seen your three threads concerning the same dilemma. I think your room and windows are beautiful and I have gleaned that you don’t need window treatments for privacy, but my sense is you would like them for adding more layered interest. I love mixing patterns also , and have seen several in previous posts, which in my opinion would work beautifully together. —- What I do think you should NOT do is have full length side panels at either window - the small window has registers at both sides below . ( It would be nice to have a carpenter build decorative boxes around those, btw, using white latticed material made for that purpose. ) The bay would look too heavy in comparison and they would take up most of your side wall space there . —- I suggest Roman shades for both windows in the white and blue vine- like pattern ( Duralee - from your ideabook ) , Windowseat cushion in the cobalt Kravet fabric , AND 2 pillows in your blue zebra drape material ( I loved that pattern with your rug - just not so much of it ) , combined with 2 solid light linen pillows. Here are the fabrics I pulled from various places -

Hi Erin - what a beautiful home. Congratulations! To begin, I would browse Smith and Noble. They have a large selection of blinds and drapes and you might find something you like. You should also browse Houzz photos. Here are some I thought might be appropriate.

I would do some blinds on the bottom and leave the arch since this is a play room make sure the blinds have no cords.

Like KR said, try to get something ordered before you move in. We moved 18 months ago and have been gradually replacing all of the window coverings in the house we moved into. COVID has caused materials shortages and for some types of treatments you may have a long wait. The answer on which type to use depends on what style you are decorating in. While the solar shades sound great, I don't know whether they would look right in a traditional home. They wouldn't be my choice. Some people like the look of interior shutters. Since you're doing a whole house you should be able to find a retailer who would be happy to spend hours with you to look at options. You can ask them what they sell the most of. If you aren't getting windows with a UV coating (we did that at our previous house when we replaced the windows), have a film applied to the inside of at least your south-facing windows if you don't go with the solar shades. I use a lot of 2 inch vertical wood blinds that can be angled to keep the sun out. Patricia is right, the sun will discolor wood floors and fade upholstery in pretty short order.