From Looney Pyramid Games Wiki

Plastic pyramids can be divided into two main groups: transparent and opaque. Currently available on the market are six different opaque colors. Opaque pyramids can yield substantive differences in games, as the large and medium sizes can conceal information in the form of small and/or medium pyramids. For those who would like to design a game with these characteristics, it may be useful to know that two small pyramids can stack and fit perfectly under one large pyramid.

Pyramid Color Year First Introduced Color Scheme
White 2003? Xeno
Silver 2016 N/A
Martian Red 2016 N/A
Kickstarter Green 2016 N/A
Gray 2024 N/A
Black 2000 Rainbow