Is there a way to tile an image in Indesign, like you can in Photoshop/patterns to Illustrator/patterns? I don't want to create an image, I want to import an image and how it repeat.
Why? To keep file sizes down and to speed up work.
Illustrator is the place to do patterns. The new Pattern creation feature in Illustrator CS6 is totally easy and intuitive.
InDesign has nothing similar natively. There is a pattern maker plug-in from Teacup Software:
You can use step and repeat to create a grid of images.... It won't reduce the file size, though. Each instance will be a link (presuming you placed the original rather than pasting it), so you'll have a few bytes in pointer info for each one, but it isn't going to bloat the file any more than placing many different links. If it's a problem, make your pattern externally and link to that as a single image. In anay case, I don't think it will have any effect at all on the size of a PDF that you would export.
As it happens, Kelly Vaughn (also known as Her Royal Geekness) posted a blog post on Patterns In InDesign just the other day: http://documentgeek.blogspot.nl/2013/04/ignite-2013-making-patterns-in -indesign.html
While it may not be exactly what you are looking for, it does give you a good overview of what *is* possible using InDesign.