I don't do a ton of stamping, but when I do, I almost always reach for my clear acrylic stamps. Most hard-core stampers prefer deeply-etched rubber over acrylic. Rubber stamps produce a crisper, cleaner image. But my priority is seeing exactly where the image will end up, and for that you can't beat clear acrylic.
One of my favorite things to do with clear acrylic stamps is to use Versamark ink to create a tone-on-tone background image on a plain sheet of patterned paper. It adds a little bit of visual interest without being too bold.
Notice what I'm using to stamp? It's a saucer for a potted plant. There's no need to spend money on acrylic blocks. You can use pretty much anything that's clear and has a flat base. In addition to the saucer, I've used a Pyrex baking dish, a CD case, and rigid plastic packaging. This saucer is my favorite though, because it's easy to hold while still keeping my fingers out of the way. It's lightweight and I can store it in the craft room (vs. the Pyrex that lives in the kitchen).
I'll share my completed layout next week, after I've given it to the Birthday Girl.