You could build a plain desk for your child but you could also build this house frame desk for bonus points. Follow the free step-by-step plans at the link.
House Frame Kids Desk
Tag: childrens desks
House Play Table
This house play table which features an angled desktop is perfect for little ones to get creative. Follow the free woodworking plans at the link.
Fold Down Desk for a Child
This fold down desk is perfect for a childs room where space is usually at a premium. It is easy to build and install using the free building plans at the link.
Kids Desk with Storage
Craft Desk for Kids
Build a house shaped childrens desk perfect for crafts and coloring. Free plans at the link.