This is too vague. A design that does what or shows what? To be blunt: a LAN (or WAN design for that matter) solves a specific set of problems within a specific set of criteria.
IE: if I needed to support 300 clients talking to 5 servers in 3 different campuses within one geographic area using Cisco hardware on a $50k budget, we might be able to provide something. Even this is too simplistic as there are at least 100 more questions I would need answered before a REAL design could be created, but a theoretical is possible at this level of detail.