Hi.
As far as I know, you cannot do that with inkscape -since the seed value is part of the filter definition.
The xml code-wise that means when a filter is applied to an object, it points to the definition and calls the set chain with the set values.
Guessing with a script one could generate random filter variants but each would need their own definition.
However, if you wanted to achieve a similar graphical appearance:=the filter not repeating through the button instances,
then group those rectangles together before adding the filter, and add the filter to the group instead.
If the result is not looking random enough, you can also ungroup the filtered group. Then each objects inside will inherit the filtered look and you can rearrange their location in a random manner.
Should result with one filter definition but with random transformations interfering with them.
I'd be great to have handles representing the filter's transformations though as with the pattern fill and what not. Guess that won't happen in the near future.
