Many of the built in excel dialog boxes use a range input box like this one:

Im not sure if they are called "Range Inputs" or whatever. This is taken from "Data Analysis" in Excel, in case you are wondering. When you click on the little image in the text box, the dialog box disappears and excel allows you to select a range of cells, which it then places in the the text box. If there is a way to incorporate this into a UserForm, please let me know
Thanks in advance!