There are dozens of other house plan style categories, such as A-Frames, Mission, Contemporary, Southwest, and Tudor to name just a few. A web search for house plans yields a mind blowing number of searchable sites. Most of these allow you to search for house plans, by style, number of bedrooms, baths, with or without a garage, or by sq. ft. of living space.
Remember that plans are not necessarily "as is." Builders can use a reverse set of plans (sometimes called a mirror image) to better site a house. It's also possible to hire an architect or modification service to personalize a plan. Ask if reproducible prints or electronic CADD files are available for the selected plan. Either will make the alteration process quicker and easier.
Having been in the business for more than 30 years, we have seen a large number of house plans which looked good at first glance. However, upon closer examination, many of these plans were found to be lacking large amounts of needed information. If a house plan is not easy to navigate or is not thoroughly detailed, then the builder is left to guess at the designer's intentions. This often means that he will "pad" his bid to make sure that he covers any unknown construction costs that may arise.
Pre-drawn house plans are those that are drawn by architects or home designers and then offered for sale, unlike those that are drawn for an individual, with input from the customer. While this method may be a great idea, there are definite benefits to purchasing pre-drawn house plans. Architects and home designers that do custom home designing also do a lot of their own designs, and it is these plans that are offered for sale, They are adept at making plans that utilize available space to the best possible advantage, and at laying out a floor plan to optimize curb appeal.