I find it funny that they can get so creative about hell but yet there is really no creative elements to their portrayal of heaven.
Well, methinks this is only obvious.
Like Jean-Paul Sartre once said: "l'enfer, c'est les autres" or in English: "Hell is other people".
Each and everyone of us experiences the one or other (or in some cases: lots of) irk about many of the people we meet in daily life. They just don't seem to fit, they act stupidly, they are just bothersome.
So yes, 'Hell' actually is 'other people', and since we are all humans, this particular feeling should be more or less the same for any of us. And thus, it is easy to create some visual image of all the things we dislike or despise (giving some creativity); which imho explains all those depictions of hell you see in traditional art.
Picturing "Paradise" is obviously much more difficult. Especially in Christian mythology it is supposed to be the ultimate wonderland. And as such, it is a thing that is is not easily to put into vision. Especially since people are all different. One persons wonderland may look pretty boring (or even abhorring) to the one standing next to him. So, in the end, the artist trying to depict some 'heavenly scenery' can only use a very selected types of depiction, should he wish that it still fits the 'general' taste.
Maa... just my thoughts about this particular subject late at night... ^^