More pieces can be added to any brand identity package as needed–letterhead, envelope, stickers, brochure, signage, etc. For many clients, a good solution is dividing a project into multiple phases. For example, Phase 1 might be the basic brand identity components outlined in the packages above, and Phase 2 might be the application of the brand elements to additional pieces.
If you don’t need a full package, I also do hourly work. This could be a product photoshoot, photo editing, social media graphics, newsletter template, etc.