Dashboard Icons / Text Size

Is it possible to have dashboard icons instead of the background image?

Can you also change the text size in the tiles?

Not sure I understand exactly what your asking apart from the obvious. Click the settings cog and adjust Font size.
Also check out :

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Text size per tile. Not globally for the dashboard.

Can you use icons in place of text for dashboard links.

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You could set up the dashboard links using ordinary "link" tiles, which gives you the option to specify your own text or images.