hi there, since i couldnt find any pages like this one i decided to make my own :/ post some of your own here if you have any good ideas!! :D (sorta like pvzcc but more simple)
here are some of mine, though they are very unoriginal
Triple, quadruple, and quintuple sunflowers
moon flower! moon wont fall at day and vica versa, but sun and moon will fall in a twilight-themed world
snow pea pod, repeater, split pea, threepeater
quadrupeater and quintupeater/fivepeater
thats it for now, but i think fire peas would be pointless unless you make them less than double their counterpart.