Their are many ways to box in pipes and the level of difficulty depends on how it need to be done. I they are small enough and close together a couple of 1x4's or so can be finished nailed together at a 90 deg then finished and installed over the pipes, providing a cover if they are close to a floor or wall. That probably the simplest. If you could attach a photo of your problem and basic dimensions It will be much easier to give an appropriate suggestion. Sometimes framing would be necessary, and you don't nessarly want the end result looking like a box over pipes, it probbley can be made to look like it belongs.