the greatest symbolism of creative is probably the 'fountain' that hurls rocks etc. (volcano) it represents the birth of an idea, the image of the volcano, the fountain elevates the power of the creative process
The river alph is your ticket. "Alph" - greek letter alpha - first letter - the beginning - creation. It is the main point of the poem, it flows everywhere therefore creation flows everywhere. Keep on with that, just write with more eloquence than i have. hope it helps.
We learnt kubla Khan was about sex and orgasm. therfore the creation involved is that of joy or eventually reproduction. Essentially we saw the metephor of nature and the creation of the city in the poem as being symbolic of life and the creation of this. refer to genesis i guess? hth.
the sexual imagery - the bursting fountain etc is significant as Coleridge compares the "creative" processes of his poem with reproduction. Remember that to the romantics, Creation was divine and to reproduce was God's doing - it was an extremely sacred thing.
Through writing a poem, in exploring his imaginative world, Coleridge reaches a point of mutual oneness with God - it is a spiritual journey as much as an imaginative one.