Echo Echo is a small white alien whose body is a living amplifier in Cartoon Network's Ben 10 animated series.
Ben 10 - Echo Echo Papercraft

Four Arms is the 12-feet tall humanoid alien character from the American animated series Ben 10.

Ben 10 - Four Arms Papercraft

We got two official papercrafts from Cartoon Network's animated series Ben 10. First is the omnitrix which Ben uses to transform himself into various alien creatures while the other is the papertoy of Ben himself.
Official Ben 10 Papercraft via Tektonten

Jo Dee's latest paper toy is from the cartoon series Ben 10. Four Arms is a Tetramand from Khoros and the sixth Omnitrix alien to appear on the series.
Ben 10 Papercraft Four Arms

Omnitrix from Ben 10, an American animated television series shown in Cartoon Network is a device that allows the main character Ben to change form into several different aliens. This was deseigned by Ryan Mangion.
Ben 10: Omnitrix Papercraft