... the watercolor effect in inkscape can be found in the main menu : Filters - Textures - Watercolor.
Just draw a shape an then select the filter.
Use Filters - Filter Editor ... to edit the filter, see this image:
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<?xml version="1.0" encoding="UTF-8"?>
<inkscape-extension xmlns="http://www.inkscape.org/namespace/inkscape/extension">
<name>Default extension example</name>
<id>default.extensions.example</id>
<param name="tab" type="notebook">
<page name="Options" gui-text="Options">
<param name="value_int" type="int" min="0" max="9" gui-text="INT type value from 0 up to 9 : ">10</param>
<param name="value_bool" type="bool" gui-text="BOOL value set to false : ">false</param>
<param name="value_space" type="float" gui-text="FLOAT value set to 0.1 custom range min 0.0 up max=99.0 : " min="0.0" max="99.0">0.1</param>
<param name="option_group selection" type="optiongroup" appearance="combo" gui-text="Options :">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
</param>
<param name="grouppick" type="bool" gui-text="selection pick ..." gui-description="This is gui-description">false</param>
<param name="pickmode" type="optiongroup" appearance="combo" gui-text="pick values group:">
<option value="first">first</option>
<option value="second">second</option>
</param>
</page>
<page name="Help" gui-text="Help for default extension example">
<label xml:space="preserve">This is example of default extension example
You can use this INX file and PY files type named 'default_extension_example'</label>
</page>
</param>
<effect>
<object-type>all</object-type>
<effects-menu>
<submenu name="catafest"/>
</effects-menu>
</effect>
<script>
<command location="inx" interpreter="python">default_extension_example.py</command>
</script>
</inkscape-extension>