Willowday shares a wonderful Mother's Day gift idea and tutorial for a wooden bead necklace or bracelet with each bead painted to represent your children. Very sweet and there are several variations so I'm sure you will find something just right for you.
A tote bag decorated with children's art is always a welcome gift and you can make it as simple or as complicated as you want. This project works well for multiple ages too. You can buy blank tote bags at craft stores or stitch your own like these from Lilla A.