Thank you for your interest in my Koi bathmat. Crocheted with fingering weight cotton 8/4 ply it could be a bathmat (it is the same size as my Ducky bathmat) or a small throw
It needs two contrasting colours or as in my example multiple colours. If you are unfamiliar with colour changing in interlocking I have included a colour changing tutorial with a small heart pattern supported with links to my YouTube channel.

As you are used of me this pattern comes in two techniques:

Interlocking Filet crochet
4 files:
Koi Multiple colours interlocking written pattern and small chart.pdf (colour change is noted with letters in the pattern)
Koi 2 colours interlocking written pattern and small chart.pdf
Colour changing tutorial Heart Interlocking.pdf
Abbreviations and instructions.pdf
109 by 74 windows, bathmat/throw
Size approximately 80 by 50 cm, 32 by 20 inches
Main colour A dark, total 1400 meters, 1500 yards (any fingering weight yarn)
Alternate colour B (2 colour version), total 1300 meters, 1400 yards (fingering weight, 8/4 ply)
Alternate colour (multiple colours version) Light Blue 500 m / 550 y, Tangerine 200 m / 220 yards, Pink 250 m / 270 y, Green 180 m / 195
Hook 3 mm (USA D-3)

Overlay mosaic crochet
4 files:
Koi Multiple colours mosaic large X chart.pdf
Koi Multiple colours mosaic small chart.pdf
Koi 2 colours mosaic large X chart.pdf
Koi 2 colours mosaic written pattern and small chart.pdf
219 stitches by 149 rows
Size approximately 80 by 50 cm, 32 by 20 inches without border
Yarn needed approximately: Colour A main, total 1200 meters, 1300 yards
Colour B alternate (2 colours version), total 1400 meters, 1500 yards
Colour B alternate (multiple colour version) ) Light Blue 700 m / 760 y, Tangerine 260 m / 280 yards, Pink 400 m / 430 y, Green 240 m / 260 y. Border not included
Hook 3 mm, (USA D-3)

Size and yarn needed will vary on your tension, hook-size and yarn-thickness

If you need advice, have questions, contact me via mail or messenger in Facebook

Also feel free to join my Facebook group where there are a lot of instructions, video tutorial links to my YouTube channel and freebees
https://www.facebook.com/groups/384871122981049