Cactus can look pretty dull most of the year, but when it warms up and they get a good drink of water, they can put out some of the brightest flowers you have ever seen.
Here is one of my cactus that is just a big bunch of nasty stickers, but has really pretty pink flowers. Even Zoie likes to stop and smell the flowers.
Here is a time lapse that I took. As you may know, cactus flowers open when the sun hits them during the day and then they close when the sun goes down.