I suggest that you take advantage of the search features on the Scottish Register of Tartans web pages to help you identify "candidate" tartans. Yes, the computer renderings of the tartans are only approximate, but they will give you a decent of idea of how they look. Link to ...

http://www.tartanregister.gov.uk/search.aspx

For those in which you might have further interest, you can always get a better idea of how they really look in a variety of ways, eg. Google images, weaver web sites, kilt-maker web sites, et. al. Finally, if you are really picky, you can obtain a swatch and examine the tartan itself.

Good luck.