I've made a concertina mini book from the Mega Pack for this week's Anything Goes on the Tando Blog:
I decorated the cover very simply with white acrylic paint and added a stamped image - it's been an age since I used my Stampotique stamps - that was stamped onto a gessoed book page. I added a doodled border and coloured everything with watercolours.
The pages of the mini book have been made attaching gelli prints together end to end and folding them concertina style. The first and last folds have been glued to the mini book pages. The back page has a piece of ribbon stuck behind it to keep the book closed when not used.