Tests have shown that ketchup is a fairly good alternative to thermal compound, reaching 71°C after 5 minutes on the Furmark. Toothpaste is worse as it gets the GPU to 90°C maximum temperature. Gamers should probably avoid using baby creams, potatoes or cheese slices, as all these products have easily reached 105°C which is far from ideal even for such a small GPU.
Obviously we don’t recommend you try this.
Photo source: videocardz.com