I thought these simple-to-make cards came out really cute!
We used this angel template, found at Free Quilt Patterns (there are lots of links to simple quilt patterns here that could be put to good use, even if you're not a quilter! I especially liked the angel and star patterns, but the choices are pretty much endless).
I printed the template onto cardstock and cut out the individual shapes (I used two copies to get a clean cut of each piece). Then the children picked out the scrapbooking paper they wanted to use -- a different color/pattern for each shape. They then traced the template onto the back of the paper, and cut out the simple shapes.
For the card, the children chose coordinating paper for the background and frame; the 12x12" sheets were cut in half to make one 6x12" strip. This was folded in half to make a 6" square side-open card. The frame piece was made by cutting out a 6" square of paper, and then tracing a 4-1/2" square template on the back, and cutting out the center.
We glued on the frames first, then centered the pieces inside the frame to assemble and glue the angels. If they chose to, the children cut and pasted additional embellishments from scraps of paper as well.
Junie B. (9) was able to complete this activity with verbal directions, only; Taz (5) needed help with tracing (I held down the shapes for him while he traced with his pencil) and assembling, and I cut out his frame for him; Sunny-boy (who will turn 3!! later this month) snipped vigorouly at the scraps while I cut out his pieces, then applied his own glue and patted the pieces in place. SB also enjoyed helping me use the paper cutter to make the card strips, and folding & creasing the paper.