Lots of things can make you have whacky dreams. Take a look first at what medications you may be taking. You can go online, look up that medication and see what the side effects are. Some of them do cause vibrant dreams.
Next, take a look at what if anything you are consuming before you go to bed, how much coffee, soda or other cafinated stuff you might consume prior to bed. Now, don't laugh....if I eat a banana before bed it's "Welcome to Wild Kingdom in Dreamworld"....not fooling!
Ok...here is the ultimate guaranteed way to have the whackiest dreams ever. I took Chantix to quit smoking and not only were these dreams right out of the Wizard of Oz...the dang things were in color. I was suppose to take the Chantix for 12 weeks but only could manage 10 because of the dreams.
So, try keeping a log of what goes on during the day, what you are taking for meds, what you are consuming for food and drink and try to get some exercise as well. It may surprise you how well you will sleep after you see what is going on.
OH...........yes, I did quit smoking. Has been two years now. Good Luck