Reaylly crazy one. You can also make one if you like :)

For crazy star cube
http://www.metacafe.com/watch/1014711/crazy_star_cube_nice_paper/

For cube
http://www.metacafe.com/watch/783529/unbelievable_white_or_black_crazy_paper_cube/

for cylinder
http://www.metacafe.com/watch/928529/crazy_paper_cylinder_how_to_make/

dick form
http://www.metacafe.com/watch/962192/awesome_paper_toy/

for unbelievable paper toy
http://www.metacafe.com/watch/777573/unbelievable_paper_toy_this_will/

for Just piece of paper crazy paper toy
http://www.metacafe.com/watch/962261/just_piece_of_paper_crazy_paper_toy/

for transformer paper toy
http://www.metacafe.com/watch/861718/unbelievable_paper_toy_transformer/

for unbelievable optical illusion paper toy
http://www.metacafe.com/watch/878241/unbelievable_optical_paper_illusion_toy/

the other paper crafts videos
http://www.metacafe.com/channels/golics/