Incorporate Color Through Accent Borders

For those without formal graphic design training, how might you introduce that essential visual dynamism that professionally designed interfaces achieve through sophisticated photography or illustrative elements?

One remarkably effective technique involves strategically implementing colorful accent borders to enhance interface segments that might otherwise appear excessively austere or undifferentiated.

For example, positioned along the upper edge of a content card:

...or as a visual indicator for currently selected navigation components:

...or flanking notification messages to reinforce their significance:

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