5. Get Messy
Art is dirty. At least the good stuff is. Encourage your parents to send the kids in clothes they don't care about. Keep around at least one spare set for every student. For parents with tight budgets, have a community tub of clothes collected from garage sales and thrift stores. Now that they're dressed right, you can get to work.
Finger painting makes the experience tactile. Don't just paint with color. Paint with texture and feel. Peel off the socks and paint with feet. Of course, use the washable stuff, but they're still going home in need of some laundry time.
And don't settle for brushes. Roll golf balls in paint. Use some tools from the garage. Wad up a newspaper. Learn cause and effect through different tools.
Be sure to dress the part, too. Don't be the teacher that backs away from a paint-handed kid. Administrators, don't confuse professional dress with professional behavior. Loosen your dress codes and let your teachers dress practically.
Many interesting textures can be built from ordinary items. Warm water, grated soap and toilet paper make a fascinating muddy goo. Various seeds mixed with a little water make a unique grainy experience. Gather an array of materials, from sandpaper to pebbles to flour, and get their hands in it. Have them describe and compare the feeling of each.
Pass around magnifying glasses so they can get into the shape and viscosity. In any way, break out of the mold. Worry less about the results, the seasons or what other teachers are putting on their walls. Concentrate of the fun, the creativity, the teamwork and the skills learned when your class expresses itself artistically.