Young Architect, by Slinky Science and More A reusable design and building set for aspiring young Architects. Create three dimensional models in just three easy steps: 1) Design a floor plan using room templates 2) Furnish floor plan using furniture guide and colored pencils 3) Build a three dimensional model on top of your floor plan.

86 Piece Magnetic Geomag Set, by Plastwood These powerful magnetic constructions sets provide hours of building fun. Plus, they offer lots of possibilities to create new dimensions.

Super Marble Run, by International Playthings This 100-piece, build-it-yourself marble run provides plenty of challenge and excitement. The colorful and sturdy plastic pieces, which include interlocking chutes, curved and straight rails, bridges, columns, and spinning wheels, can be snapped together in any number of ways to form exciting courses for the five small marbles.

Building Set (220 pieces), by T-N-T International Inc Frontier Building Sets inspire creativity and develop building skills. Sanded and stained interlocking real wood logs make play time fun. Logs of different lengths make walls with windows and doors. Wooden gables and a slat roof make Frontier Buildings look authentic.

Rokenbok System Beams & Blocks, by Rokenbok Build new! Build more! Build better! This set contains an assortment of 161 short and long beams and connectors (and a disassembly tool). Detailed building plans are included, though they are not as easy to follow as you might hope. The constructed sets are probably too fragile for use around younger siblings but are endlessly expandable.