I will try and find a picture, but I used a bunch of Mickey Head shaped diecuts and placed letter stickers across for our name. They were all different colors so it was really bright and easy to spot. I placed it on some patterened paper and some card stock. Then I laminated the whole thing, popped in some eyelets and used zip ties to put it on the stroller. I also decorated the stroller with a big grosgrain ribbon bow, just in case.
We always found our stroller in the sea of strollers and actually had several other guests stop us and ask where they could get one.
If I can find a picture I will post. The mickey heads are just a pack I picked up at M's.