We've got some shiny new layers you can use to upgrade or modify your PiBow. Find them all here: http://shop.pimoroni.com/products/pibow-modification-layers
Clear Diffusion Layer
A nice clear frosted top for the B+ PiBow, doesn't work with the Coupe for obvious reasons, although you can hack up some extension layers to sort-of make it work.
The clear diffusion layer is great for Unicorn HAT and looks best on the Rainbow PiBow.
Ninja Diffusion Layer
My personal favourite of the two. The Ninja diffusion layer is made from a frosted version of the dark, smoky perspex we use in the PiBow Ninja. The dark colour makes UnicornHAT look really slick.
LEGO (R) Compatible Layer
Back by popular demand, the new and improved LEGO (R) compatible layer is absolutely peppers with holes for mounting. You can use this on the bottom, or perhaps even the top of your full-sized PiBow, or on the bottom of a PiBow Coupe!
Last but not least, we also have a Coupe Top... why?, you might ask! Ninja Coupe. That's why.