It took me a little while to think of something orringinal to draw since there are so many scenes that come to mind for this theme. Here's what I finally decided on.
Brings back memories of my brother and I building forts in the living room with furniture, boxes and blankets when we were little. *sigh* Those were the days. Figured Mac and Bloo enjoyed the same thing, especially with the hints given in "Bloo's the Boss".