This is a repost from the succulent forum. Marie I thought that you would find this interesting. The color difference between seasons is so significant on this plant. My regular COT's all have the same red blooms year round, maybe a tad lighter, but not noticable.

http://forums.gardenweb.com/forums/load/cacti/msg111712464015.html?1

Here is a link that might be useful: Crown of Thorns color