Rower Grainger, 32, picked up her third silver medal in three consecutive Olympics.
She admitted that the prospect of the 2012 Games was a "draw".
She said: "There's still a gold to be won."
Canoeist Florence, 26, spoke of the moment he took a silver medal in the men's slalom.
He said: "That final run, to be honest that's the easy part. It's before you start the run, that is the tough part."
The Aberdeen athlete continued: "As soon as you start the run, you are doing what you are used to doing day-in day-out.
The four athletes emerged from Edinburgh castle to huge applause from a crowd of waiting well-wishers.
Chris Hoy: "It's fantastic to be back"
A bagpiper played as the sportsmen raised their arms and cheered.
They climbed aboard a red open-top bus, their medals hanging around their necks, and the vehicle set off down the Royal Mile.
Cheering crowds packed the pavements as the bus rolled past.
Louise Martin, chair of sportscotland, said: "The achievements of the four Scottish medallists will hopefully inspire and motivate our young people to take part in sport and physical activity and engender the belief that they too can succeed."
Deputy First Minister Nicola Sturgeon said: "The Scottish Government's overriding priority is to see an increase in sporting participation rates throughout Scotland and the success of our four medallists can only be a major influence on our young people and help inspire the heroes of tomorrow."
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