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If you don`t like the soleta scenario - putting huge relecting or rediecting mirror system close to the sun-venusian L1 point - than the best way is:
- introduce in the upper layers of the venusian atmosphere self-replicating floating machines powered by sun light. The machines are small ~100% reflecting mirrors ( say, 1 cm. areostats with aluminium coating of the top sides, and black 'bellies'...) That will stop almost completely the power income in the atmosphere and will reverse the greenhousing - venus will loose more heat that it receives now... You need no less than 500 years the surface to cool down to reasonable temperatures...
It certainly seems possible to build floating bubbles out of indigenous material. For instance, carbon dioxide and sufuric acid can be used to make carbon disulfiide and hydrogen. The carbon disulfide can be polymerized into thin films, see http://tinyurl.com/5rfvs .
A bubble made of a polythiene film and filled with hydrogen probably could be made to float high in the atmosphere. If polythiene were a semiconductor, then the bandgap could probably be engineered to make it reflective, or photovoltaic, or to make transistors.
A thick enough layer of reflective dumb bubbles would reduce insolation enough to cool the planet and allow the CO2 to start precipitating. There'd probably be tremendous storms generated as precipitation started, because the dark side would cool off a little sooner than the lit side. That would be a sight to see!
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