My advice is don't spend them yet. They will stay available indefinately.
I wasted my free points on some items which I have never used.
Since then I have purchased a few 1000 point bundles and still managed to buy some items which I hardly ever use.
My two best purchases were the "multi-tab" and the "stonesthrow greenhouse". It is not the greenhouse which I find really useful, though it is nice to have and probably more useful if you also have Season's EP. It is the "Swift grow garden station" and to a lesser extent, the "plants vs zombies sunflower" which I find really worthwhile. Currently, I think it is only possible to buy the three gardening items as a collection and you would have to buy some extra points to buy the collection. (I paid 1,700 points for this). I don't know if they will eventually become available seperately.
I suggest, wait until you find something you are sure you want and if necessary, buy a few more points in order to get it.