So you've got bored of white boxes with text on it as the representation of your business?

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Go to C:\Users\*your_user's_name*\AppData\LocalLow\Hovgaard Games\Big Ambitions\SaveGames\EA 0.4\*save name (for instance mine is cOrc44hyLEqpTXpW9L+8UA==)*/*business name* and then simply replace .JPGs with your desired ones (but with the same name!).

Keep in mind file should be .JPG, Billboard and SquareSign size is 1024x1024, WideSign is 1024x128

You may use whatever tool you like, I personally use Figma - it's free and easy to use, so further example will be performed there.

• Go to Figma.com

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• Create account or log in

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• Select Design file, then Drafts

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• Create new frame and select its size (1024x1024 for Billboars and 1024x128 for Wide signs)

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• Fill it with any colour to your preferences

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• Add text

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• Add some seasonings to your taste ;) I simply google .svg or .png shapes I like

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• Final check that everything is inside your frame (if not, just drag it there, you may use left menu for this as well), then Export this masterpiece as JPG

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• Open folder with Business' signs (C:\Users\*your_user's_name*\AppData\LocalLow\Hovgaard Games\Big Ambitions\SaveGames\EA 0.4\*save name (for instance mine is cOrc44hyLEqpTXpW9L+8UA==)*/*business name*) and replace its file with created one (they should be named the same)

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• Repat those steps in Figma to create Wide Sign (1024x128).

Note: you can create another frame with F on same Canvas, copy-paste and slice what you've created to your needs
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• Final look of the folder

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As I undersand, Billboard is used in ads, when you use Marketing via CityAds, SquareSign - the ones hanging alongside your building with business, WideSign - as on screenshot above.

Sorry for misspelling and grammar mistakes.
I hope this guide will help your businesses acquire more personality :)