Do you have access to Pixie 2 on your computer? Have you taken a look at it? It’s not just a painting/drawing program. Pixie 2 has a lot of pre-made activities involving reading, math, social studies, and science which allow students to explore concepts using computer manipulatives. To find these activities, go to the File Menu, click open, and choose activities. There you should find a variety of pre made activities.
If you don't have Pixie on your computer, you can download a 30 day trial here.
Go ahead, give it a try!