Scratch

Alright then, whatever you try and do you can't get real and proper 3D sprites in Scratch. The furthest thing you can do with it is pseudo 3D, and it would be very unlikely if anyone managed to make a perfectly 3D project. Heres a trick on how to make it look from top view:
[blocks]<change size by( [/blocks]
[blocks]<change x by( [/blocks]
[blocks]<change y by( [/blocks]
And the very furthest look to 3D is by doing:
[blocks]<switch to costume[ [/blocks]
Or:
[blocks]<next costume>[/blocks]
But doing the method just above is extremely hard. In fact, it may only be possible for film. I advise you that the best way to make it look 3D is by doing the first method shown. However, some have managed to make it look perfectly 3D, however most of what I've seen are racing games