For a sense of ongoing artistic inspiration and a liberal sense of artistic freedom, head just west of the city to the outlying neighborhood of Jaimanitas, where you'll encounter the wondrous one-man art movement known as Fusterlandia. Created by Cuban artist José Fuster, it's quickly obvious that the colorful mosaics that adorn this small neighborhood are inspired by the work of Gaudi, lending a sense of fantasy and wonder that stands out against the relative poverty of the surrounding area.
Put aside an hour or two to wander among houses and garages, climb the observation tower, and even view a bus stop adorned with a rainbow of ceramics, while the art on display ranges from surreal eyes and faces to over-sized chess pieces. While here, you may purchase small, relatively inexpensive works of art from Fuster himself, and, if you're fortunate, he'll be at his easel creating while you're experiencing the neighborhood. Also, unlike much of your experience in Havana, you won't be frequently harangued into buying things, although it's worth grabbing a typical Cuban lunch at the on-site restaurant.
Buses do travel from central Havana, although you may have to change over to another bus or another form of transportation depending on your destination. Cab rides may be easiest and take 20-25 minutes at a cost of about 20 CUC.