What's the architectural style of your house? Should that have something to do with these designs?

Well...not sure why one would want a room with built-ins which are not in keeping with the architectural style of the house.

Perhaps, the realtor can come up with an appealing way to describe "funky" when it's time for resale.

Here's a good pinterest page that may provide some inspiration . . .

https://www.pinterest.com/em_henderson/shelving/?lp=true

I also thought this was definitely a funky idea . . . . shelving made from vintage coffee tables.

Here's another one I came across . . . .

https://www.archiproducts.com/en/products/cubit-by-mymito/open-modular-bookcase-cubit-modular-bookcase_83213

Here's a google search for "tetris bookshelf" . . . definitely geometric . . .

https://www.google.com/search?q=tetris+bookshelf&source=lnms&tbm=isch&sa=X&ved=0ahUKEwj865uOkorgAhXoYt8KHXJ1B78Q_AUIDygC&biw=1280&bih=864

Your comment about hexagons got me thinking . . . I googled for "honeycomb bookshelf":

https://www.google.com/search?biw=1280&bih=864&tbm=isch&sa=1&ei=iqNLXOvZH6as_Qbdl4TYAw&q=honeycomb+bookshelf&oq=hon&gs_l=img.1.0.0i67l9j0.27787.28006..30776...0.0..0.67.197.3......1....1..gws-wiz-img.x6sjEnKqcjs

@wysmama My pleasure. Please come back and post the finished product. I'd love to see what you do.

I know you weren't really thinking traditional, but something like this with doors on the bottom, might also give your daughter some closed storage if that's a concern. You could jazz it up with some fun wallpaper on the back. As noted above, could be done with ikea pieces and some trim.

I have seen a few window benches where instead of storage beneath, they pull out into bed for sleepovers. Very cool for kids, but hidden function that you'd never guess. Depends how much width you have

For built ins, personally I try to avoid large aftermarket bookshelves... Have to awkwardly strap them to the wall so they don't tip over. Why not do a more plain/traditional bookshelf over a cabinet, and then have the funkiness be a bold color or the items themselves stored on it? Sometimes less is more (without seeing the room and more of your home)

Wysmama, my apologies. In my post above I was simply trying to point out the value and importance of architectural consistency in a home, and that good architectural design is a learning opportunity for children (since design and architecture are not taught in the educational systems), as well as the value it has if resale is considered.

Good luck on your project!

I agree with Patricia CC that a child's room should reflect what the child likes. However, built-ins are expensive and permanent (well to a certain degree) and should not be subject to a child's particular likes at the moment which in my experience are quite fickle. I agree with Virgil that it should be consistent with the overall architectural style of the house. The child can then decorate and style the built-ins anyway he/she wants (within reason of course).