These papercrafts are Namekian Dragon Balls, the set of Dragon Balls created by Grand Elder Guru on the planet Namek, based on the Dragon Ball series, the paper models are created by Viper. There is another version here: Dragon Balls Papercrafts Ver.1.
These Dragon Balls are similar to the ones on Earth in power and appearance. However, the Namekian Dragon Balls are as large as basketballs; Krillin was surprised how big the Namekian Dragon Ball were in comparison to Earth's Dragon Balls while he was on Namek.
There are two extra precautions taken on the Namekian Dragon Balls: first, the summoner is required to utter a Namekian password in order to summon Porunga, the Dragon of Dreams. The other precaution is that the wishes must be spoken in the Namekian language. Once Porunga is summoned, he has the ability to grant three wishes, that are somewhat different in power to Shenron's wishes. For example, Porunga could only revive one person at a time while Shenron could revive an infinite number of people at a time, but Porunga can revive the same person as many times as the summoner pleases, while Shenron will only revive a person once.
The time the Namekian Dragon Balls take to restore is 130 days, not like the 365 days required for the Dragon Balls on Earth, as a year for the planet Namek lasts only 130 Earth days. The Namekian Dragon Balls are never shown spreading around the planet after three wishes were made in the series, but they are shown spreading in video games. [Source: wikia]
You can download these papercraft templates here: Dragon Ball - Namekian Dragon Balls Ver.2 Free Papercrafts Download