Hi welcome to the arena!
Ooo goody, G1, Rainbow Brite and Last Unicorn nursery art! So sweet! You might be able to find some wall decals, and you can always print stuff out on transparencies or upload art files to VistaPrint to get larger sizes. We have plenty of people here who would probably love to do some custom art for you if you like; check the Arts n Crafts forum if you are interested in something like that. Feel free to start a thread if you have any questions you don't see the answer to.
We love to see pony pictures, and I hope you decide to share how it turns out in the Pony Brag forum.
Hope you have a great time here!