I did one, though not painted, I can post if you want.
Here I'll post it.
The issue is mainly that Tiggy himself doesn't exactly have equipment that would make him stand out in particular. You can pretty much do the job with any Librarian with a giant stick used to hit people.
In my case I want little to no bling on my Marine commanders. This one is using the front half of the MkIII armor, and then the back half is a Grey Knight (while the two fit together, they aren't terribly great looking until paint is thrown on. I then used the Staff from the Grey Knight kit and cut out the skull, and the hand extending will eventually be Green Stuffed to incorporate a lightning or fire sorta thing. Hadn't decided yet. Then lastly the head and backpack are from FW
Not perfectly cleaned up yet as you can see, but everything is a work of progress at the moment so...
I'd post the picture directly but I can't remember how to resize the pictures on Imgur so it's a link.