You can do whatever appeals to you. I can picture drapes where the check or stripe is at the top and the bottom with the toile in the middle too. I can also picture it where rather than being straight across, the seam is a gentle scallop shape to add more interest. A lot depends on the room and the look you are going for. In my guest room, I was inspired by toile, but found a fabric in the colors I wanted that was similar to a toile. Since the only thing looking into the windows might be a deer, I decided that sheers below were sufficient. I used the fabric to make pick up valances. I lined them with a solid navy, but that was because the trim I found to edge the valance was multi colored. On the bedding I blended another fabric with the valance fabric so the pillows tie the room together. Desk nook Close up of valance and fabrics and trim Dupioni silk combined with valance fabric to make bed pillows....I know the pics are too small for the room....I have some new ones I need to get framed up yet....

With so dimensions of the room you should buy a queen size bed. Now you can get the dimensions of your room on paper and you can get dimensions of your bed , make piece of paper and try to fit in your room.

I am interested to find a way forward with cyan, purple and yellow! What a challenge. I have teen boys too. Some boys care a lot about how their room looks, some boys don't care at all---I have both in my house, ha. First of all, you need to add to this thread a room layout. That will help. Next, with those colors, I would think in terms of a yellow comforter, cyan (bright blue, right?) colored sheets, maybe, and a little dash of purple here and there. Maybe some art or a wall hanging/tapestry (or a rug) with those colors can give you something to pull colors from. You haven't mentioned a budget?

Gray and beige can work beautifully together in a neutral scheme. Your curtains will be just fine. You are just missing a lot of the elements needed to finish out your room: bed frame/headboard, nightstands (the ones you have are too small), art, lamps, a properly sized rug. Not to be harsh, but your bed looks so sad. Get some nice crisp white bedding. The beige bedding blends right into the floor. You need texture: wood, woven materials, linen, a nubby throw. Glass and metallic elements can provide some contrast as well. Do you want to add another color or just stick with neutrals? What kind of look are you aiming for - modern, a touch boho?