designating 2 categories per page

I would love to designate 2 categories to list together on their own page, is there a way to do this?

I tried options like these with no results.

[categorythumbnaillist 11, 195]
[categorythumbnaillist 11+195]

I don’t want the categories to list separately so listing one and then the other will not accomplish what I’m looking for.

Or, is there an alternate plug in I should try?

I appreciate any help anyone can offer. Thank you!

http://wordpress.org/extend/plugins/categoy-thumbnail-list/