My opinion is before you start putting money into making the cage pretty, put it into the things that will keep your snake healthy. Start off with:
1) Thermostat- Dpending on your budget and what style you choose these will run from about $25- $150.
2) Under Tank Heater- several different brands available. the best size will cover approx. 1/2 to 2/3 of the floor area of your tank.
3) Digital thermometer/hygrometer- The little stick-on dial type are notorious for giving inaccurate readings.
Alot of you humidity issues are coming from 2 places: 1) the heat lamp, because they get so hot, and 2) an open screen top. Here is a link to some pics I posted on what I did to cover the screen. Basically it's just cutting some cardboard into panels that fit across the sceen and wrapping them in foil. You can add or remove panels as necessary to help control humidity.
http://www.repticzone.com/forums/mes...hon/2/93/main/
To make the snake feel more secure in the tank you should cover the back and 2 ends. You can use aquarium scenery, cloth, paper, cardboard, cork board,etc...
There are too many suggestions and ideas so I'm gonna leave it at this for now...
Rob