Making a semi jagged chunk of balsa or sprue, then painting it the same color as your broken statue, would probably do the trick for most of your infantry size bases.
For somewhat more effort, you can get some thermoplastic or a silicone mold kit, and make castings of that statue base and/or other scenery bits (including non gaming stuff). Then use greenstuff or milliput or whatever to cast pieces, and break up the cast pieces in different ways to make non-identical rubble bits.
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