well is also the only way using bitmap and not vector to enlarge a pattern without loosing quality
but you may also crop before mirroring i post here a example (based on same orbs posted by DD)
see this was more a tile that a pattern even if was seamless
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sphergbek.jpg [ 167.9 KiB | Viewed 4302 times ]
but cropping away the border and mirroring also along the diagonal (thank to David that liked this idea of a 3x3 mirror array with the4 original centered, and added the option to the GMIC mirror filter)...voila this look more as pattern
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sphergbenk.jpg [ 165.51 KiB | Viewed 4302 times ]