Years ago I was able to download Lego Minifigs from somewhere that were then added to the collection of Sprites. Is this still possible somehow? I can't remember where I found them and I do think it was back in Scratch 1.4 but I know my students would love to use them and I just got some Lego WeDos and it was just such a fun way to have minifigs moving on the screen and in real life.
you can use the soft blockcad
http://www.blockcad.net/
they are a lot of minifigs
with blockcad you can take a snapshot of your minifig or your own sprite and it is exported directly in png format
its is very useful to use with scratch
see this video
https://vimeo.com/121334195
french projects with legos and scratch here ( children 8 years old )
https://scratch.mit.edu/users/pommerit/
Alain