I just finished doing my kids bathroom in a Disney theme. I think the total I spent came in just around $130, although my math skills are not so good. I could be off.
I had two rolls of self stick border that I found a year ago in a thrift store, 99 cents each. It has Mickey, Minnie, Donald and Goofy each in their own square. The colors are kind of bright. Yellow, red, green and a turquoisy blue . So I let the kids choose paint colors based off of those. They chose a turquoise blue, Buzz Blaster Blue from Home Depot. I picked a trim color that is white with a tint of blue called Glacier. The door, trim and cabinet all got painted the white color.
DH picked up some Mickey stamps from Home Depot for me, Mickey glove, Mickey icon, and the castle. I stamped them on the top and bottom of the door, and at the top of the cabinet door. Didn't want to overkill the theme.
Total for paint was $35.
Bought towels at Target when they were on sale. I got yellow, blue and pink. They look great against the wall color.
For art on the walls, I framed some lithos we got from DVD presales. Frames I found at Michaels 50% off, $5 a piece for four. Kids chose one each to frame from Lilo and Stitch, Monsters Inc., Beauty and the Beast and Finding Nemo.
I also framed some autographed character pics the kids got for their birthdays. Pluto and Belle, two frames $5 a piece.
Shower curtain was $15 from Target. It is clear with colored circles on it.
Finally for some much needed storage, I bought an over the toilet cabinet from Target. On sale it was $25.
We have some of the Mickey soap from Basin. I will need to stock up on our next trip. It smells so yummy.
I will also be looking for drawer pulls.
Our bathroom turned out great, the kids love it and the pics are great reminders of our trips.
Good luck on your project!