An easy/quilk quilt to make--
Cut strips from your childrens themed fabrics, adding some bright solids. Stitch these strips together into a strip set.
And then cut into strips again. You can make the strips any size you need to make the finished size quilt you need.
Make a bunch of these sets. For the younger children you don't have to separate boys/girls because you used children themed fabrics and bright solids.
Mix them up, sew the rows together and you have a quilt.