Take a look at these gorgeous hand painted bowls at Creature Comforts! Target and other big box stores usually carry an assortment of all white dishware that are perfect for this project so you don't have to limit yourself to just bowls.
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.
You'll be recycling as well as making a gift with this creative tissue box flower vase at Créme de la Craft. Newspaper works well but any paper - tissue, children's art, wrapping paper - is suitable to make this a unique gift.
Here's a sweet Mother's Day card idea that uses fingerprints for lily of the valley. You'll be surprised how the leaves are made though! Visit Léon, Pas Sur Les Murs for the tutorial. English translation here.