I used the single idea book with my 8th grade students as well last spring.
We called ours a theme book. My students made their own hard bound books,
chose a theme and made each page a beautiful work of art based on the theme.
They were beautiful! I plan to use the same idea in place of a sketchbook
second semester. By the way, one girl made 4 theme books during the semester
and another one made a book about movie stars with fold outs and pop outs and
a hand made box to fit the whole thing in that was about 14X18".
Whoever donated this idea origionally -- thanks!