After watching the entirety of "Star Wars: Droids" today on Disney+, I was struck by some of the cool, original designs used in the cartoon.
I used some spare Build-A-Droid parts and quickly whipped up these work-in-progress droids (still need painting) based on 2 of the more memorable astromech designs from the 2 part special "The Great Heep".
The spherical astromech with the single leg and antennae is the only one I was able to find a nice clear image of online.
Both droids have swiveling upper domes. The 2 legged droid has additional articulation at the ankles.
I will most likely not be following the colorways used in the cartoon and instead utilizing much more movie styled colors and weathering to make them fit in with the more realistic movie figures.