We have been hearing of a lot of people working on Formidable-Bootstrap integration. We have created an add-on that automatically adds all the Bootstrap classes and loads the Bootstrap styling, to make beautiful forms even faster and easier.
Normally, a value can be added before and/or after the input by directly inserting them into the customizable HTML. This add-on includes an extra setting in the field options to do this simply and instantly.
The settings illustrated above will create a field like this:
The full Bootstrap 3.0.2 css is included, which means there is a lot more you can use that you will need to see the Bootstrap docs for. A lot the the available classes will work when you insert them into the "CSS layout classes" box in your field options. Specifically, the sizing options found here.
Note: This add-on requires the changes included in Formidable v1.07.02 which is currently in beta. Please make sure you are running at least v1.07.02b2 of Formidable before using this add-on.