In Greek mythology, the Arts are characterized as sisters. This depiction illustrates the intimate and familial relationship that Music, Verse, and the Visual and Performing Arts bear toward one another. Keeping this in mind, I suggest the following Journal activity.
Go to the museum and choose an exhibit that interests you. Describe it in your journal. Include as much detail as possible. I would also suggest sketching the piece if you like. Then write a series of stories using this exhibit as a jumping off point. It can be a series of theme related shorts, a poem with many stanzas (Write a stanza each day.), or the beginning of a novel. You decide. The idea with this exercise is to incrementally build the length of the pieces you write.
Learn more about the muses of Greek mythology.