Switch Plates Snap-Together Covers

Hello,
Years ago I remember seeing in HD plastic Switch Plates for home usage that snapped together.
It was possible using these to make up most any combination; perhaps two
typical single pole, and a blank to cover up an existing cutout (alongside or maybe above), etc.
Have a perfect application for them, but Can't find them anymore.
Anyone familiar with them ?
Brand ?
Who has ?
Much thanks, Bob
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Home Depot carries Leviton Sectional Wall Plates. http://www.homedepot.com/s/leviton%2520sectional%2520wall%2520plate?NCNI-5
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