How do I keep a series of LEDs flashing throughout a sketch

I have a sketch running an OLED graphic display module on the front of an adult shop on my model railway. It shows several different text and bitmap images. I am pretty proud of myself up to here but now I am lost. It is a noobe question but I have now put LEDs around the sign that I want to flash. Ideally it would be great to have the flash rate vary depending on the image or text displayed but this is most likely beyond my skill level.
How do I keep LEDs flashing constantly through the whole sketch.

See Using millis() for timing. A beginners guide, Several things at the same time and the BlinkWithoutDelay example in the IDE

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Thank you very much for taking the time to reply to my question. I greatly appreciate it.

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