If there was A robot that I could build it will be a robot that could help with medical attention.Which means tempature,cooking,babysitting last but not least night watch.It could also do scan the room for mold leaky pipes and see if termites eat wood.
Other robots from Synthiam community

Luis's Using The Sure Dc Ss503v100 With Ezb4 From Ez-Robots
Using the Sure DC SS503V100 with EZB4 from EZ-Robots Using UART Communication We will be using these pins on the Sure...

Ezang's Mr. Conehead Dancing, Take 1 - I Will Try More...
This is a test, hard to balance Mr. ConeHead dancing Take 2 soon :-)

Tony1952's My Rolly Boxbot
My Wall-E has a new playmate with tracks, my own Rolly. My Wall-E has a new playmate with tracks, my own Rolly. I made...