I have had them for years but not really used them very much, mainly due to fear of them looking rubbish, but I am pretty happy with the outcomes.
I spent a whole day creating backgrounds, using a mix of brushos, spray inks and distress inks on a variety of paper types, some shiny photo card and others on smooth white card. I also used a Gelli plate for most of the backgrounds.
So here are a few of my favourites.
Addicted to Stamps - Colour Challenge
TTCRD - ATG
Here is a place to start - Custom Background