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Cyan Dye not enough? Well, this should do the trick.
Yes, the RGB Glass works with the beacons without any problems!
From left to right: Concrete Powder | Concrete Block, Stairs, Slab | Wool Block, Stairs, Slab | Wood Planks, Stairs, Slab | Terracotta Block, Stairs, Slab | Glass Block, Stairs, Slab | Redstone Lamp | Antiblock | Glowstone
A rainbow coloured... something and some colourful glass
Think minecraft is lacking variety in it's wood types? Want more, but don't want to look for any biome mods that fit your needs? Well, just take the RGB Plank, colour it in any wood (-or not-) colour you want and have every wood type you need!
You can now access all the blocks from the prismarine family, fresh out of the ocean. Have a look at them here.
RGB Prismarine in it's natural habitat, fresh - still in the ocean... Create a wonderful variety of prismarine buildings, structures, whatever you wish!