In his painting, among other techniques, Vetulani uses ink and acrylic paint combined with photographs. He works with oil paint and also uses black silicone as a medium. He paints on canvas, wood, zinc plates and sponge-foam. Interviewed in 1998, he said about working on sponge: “ it's a simple, light material and always ready to use. The colour and texture meet my aesthetic requirements and it has a lot of volume. Physically it is very present in the space. The ink and paint are immediately absorbed into the foam surface, making any corrections useless. It is a material which lends itself to quick application and is particularly good for spontaneous sketching with paint squeezed directly from the tube. The fact that these works will not last (sponge is not a very durable material) does not deter me; it suits the character of the work very well and to an extent reflects my ideas about art”. His sculptures are made of bronze, steel, hot-glue and packing tape. He is inspired by animals and people as well as religious architecture and the surrounding Dutch nature and landscape.