Certainly – if they are good enough! See here for file requirements. It is important to note that most professional photographers using digital cameras cannot compete with the quality provided by our digital system here. Most digital cameras are barely equivalent to shooting a high quality 35mm transparency which will succeed if only small prints are required but if you want the best you need to use the best process available to you.
If you have files that you are happy with, you can easily order whatever you need on our Inkjet Lab website.