Absolutely! I can guide you step by step on how to make very simple slippers using leftover yarn and just one swatch. These will be cozy, quick to make, and perfect for beginners. I’ll make it detailed and easy to follow.

Materials Needed:
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Leftover yarn (any thickness works, but medium weight is easiest)
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Crochet hook or knitting needles (matching your yarn weight)
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Scissors
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Tapestry needle (for sewing pieces together)
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Optional: Non-slip sole material (felt or hot glue dots)

Step 1: Make the Swatch
You only need one rectangular or square swatch. This will become the main part of your slipper.
Crochet Version (simplest):
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Make a chain as long as your foot (for example, 20–25 chains for kids, 25–30 for adults).
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Single crochet (sc) into each chain across.
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Turn, chain 1, and sc back across.
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Repeat until the swatch is wide enough to cover the top of your foot (usually 20–25 rows depending on foot size).
Knitting Version (simplest):
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Cast on enough stitches to fit the width of your foot.
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Knit every row (garter stitch) until your swatch is long enough to wrap around your foot lengthwise.

Step 2: Shape the Slipper
You now have a rectangle. You’ll fold and stitch it into a slipper shape.
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Fold the swatch in half lengthwise so that the shorter ends are together. This will form the toe of the slipper.
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Use your yarn and tapestry needle to sew the toe closed. You can do a simple whip stitch along the edge.
Step 3: Form the Heel
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Fold the slipper in half widthwise over your foot to find the heel.
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Sew the back edge closed for the heel. Make sure to leave the opening for your foot to slide in.
Step 4: Finishing Touches
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Optional: Add a cuff or edge by crocheting or knitting a few rows around the slipper opening.
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Optional: Attach a non-slip sole (felt or hot glue dots) for safety on smooth floors.
Tips for a Perfect Fit
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Try the swatch on your foot before sewing the heel to adjust length.
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Leftover yarn works best when the yarns are similar thickness.
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You can make them fuzzy or colorful by mixing yarns.

This method is basically zero-waste because you only need one swatch and leftover yarn! You can make a pair in less than an hour if your yarn is bulky.
If you want, I can draw a simple step-by-step diagram showing exactly how to fold and sew your one swatch into a slipper—this makes it super easy to follow visually.
Watch tutorial: