Me too! I have a few larger blocks on my desk - I use them as weights when I need to keep something flat while it's drying. They also make great palettes for ink.
Here are a few tutorials in our archives that feature an acrylic block:
Stamped Acrylic Block Background
(block used for monoprinting)
(block used as a weight)
Shaving Cream Sparkle
(block used as an applicator tool)