Charts are included for repeats suitable for punchcards, where the designs must repeat in height to a minimum of 36 rows.
Some reminders: the BW pngs here are intended for import into a paint program or image processor where they can be magnified to suit, with a grid view for counting cells to consider the width of floats if used in single bed fair isle, adjust the design in DIY variations, or import into download programs as provided.
The tiled repeats help to visualize how the final appearance on the knit side.
While the pngs are shared in BW indexed mode, when dragged to desktops or otherwise copied and are opened in image processors, they may change to RGB mode by default and will need to be converted back to BW indexed mode prior to use for import and download to knitting machines.
Some machine models will automatically mirror the image horizontally, depending on brand and model year as does Ayab software.
When direction matters, ie in representational designs or transfer lace, the mirroring may be performed on the image provided before using it, or by using the appropriate button or command after downloading to electronic machines.
Punchcard users can mirror after the fact by simply turning the card over before inserting it, after marking and numbering at least the starting row on its reverse.
To retain symmetry in developing half-drop or brick repeats, having an even number of stitches and rows in the original design is useful. Some designs are broken up in ways that are subject to use based on personal visual preferences.
If used for blankets, the repeats can be tiled to dimensions leaving room for coordinated borders.
12X10 
12X10 to 12X20 brick 
12X10 to 24X10 half drop 
24X24 
24X28 
10X8
32X32 
34X34 
43X43 
adjusted to 44X44, an all symmetrical suitable as a single motif or in larger formats 
brick 44X88 
brick tile 
half drop tile 84X44 
3 color 14X3, requires a different color separation than KRC, each color in each row needs to be knit twice 
the 2-color version 
From weaving drafts: a mosaic-like design 
the 68X58 png 
cropped to 67X58 to avoid double stitches 
its half drop repeat 134X68 
the source for a much smaller repeat 
the 14X20 png 
When all you need is a border, repeats that may be used vertically or horizontally, presented in punchcard configuration, 24X21: 
24X20, rotated for horizontal use would become usable on electronic models only 
From To mesh or not to mesh 9: more on mock filet design 
See the post for additional repeats and my method of developing the design.
I could not find the source for this Pinterest find on the upper left, which results in a combination of large mesh 
and single transfers to create the heart shape.
The initial 24X44 png 
brick repeat, 24X88
with more knit stitches between shapes, 36X88 
the knit rows separating the stripes of heart motifs are highlighted in red.
On Brother machines the KC does advance the repeat in standard lace, so each of those red stripes is reduced to two rows of blank cells, resulting in the 36X88 repeat charted on the far right 
A small proof of concept knit in 2/18 wool 
A Studio 560 was my first electronic model machine, owned decades ago. Among the mylars saved even though the machine was sold many years ago, I found this repeat, 24X47 cells, the last offered in this series. Studio mylar sheets were marked in 6X5 blocks instead of Brother’s 5X5. The punchcard repeat chart here is outlined in 6X6 blocks of cells, the convention in Brother punchcards. 
the png 
A series also shared in the post Seasonal knits inspired by published repeats 1
two from the various groupings
24X39
24X78 