Since Halloween is near these are all my related alters:

 And the sketches I based them on:

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Here is another fan art group of alters I've done, this time the theme is Thundercats:

The Sword of Omen as a Jitte:

Cheetara as a Stoneforge Mystic:

Panthro on a Beast Within:

A Command Tower altered into a Cat's Lair:

Some reinforcements arriving:

Mumm-Ra as a transforming Delver of Secrets:

And a Swamp made into Mumm-Ra's pyramid:

The only sketches I've made were for Cheetara and Panthro, the rest were drawn straight on the cards.