Considering the original game was based on actual Legos, and players from the beta had arms and legs, I can say with authority that Blockland's theme is toy based, not Rayman. However, Rayman might have influenced the final appearance of the player model.
Also, I'm interested to see what Badspot has to say about the origin of the armless/legless player model.
EDIT:
ya we're just toys running around and skiing on 1 feet bumps in the middle of a winter wasteland
Have you ever see the island of misfit toys?