>>>With my grid class I want the user to be able to select the highlight color. I plan on implementing a right click menu to launch the color picker. To store this color I thought about using the registry so I could easily store colors for each grid if so desired and also so I don't have to depend on a table.
>>>Is this a solid design idea?
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>>In multi-user enviroment it makes sense to keep it for each user separately, i.e. you have a table 'usersettings', or one setting for everyone in table 'systemsettings', and you provide interface to fill these entries.
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>I planned on using hkey_current_user. This would allow me to retrofit a load of apps without creating tables for them all.

I prefer table solution, more consistent with data-centric approach :). Anyway, you application has tables, so few extra ones would not hurt.