Currency picker snippet that needs to be added to the shopify theme in the snippets folder to be used in conjunction with currencies.liquid at https://gist.github.com/palimadra/98127337d73270923925

currency-pciker-shopify.html

<label class="currency-picker__wrapper">
  <span class="currency-picker__label">Pick a currency</span>
  <select class="currency-picker" name="currencies" style="display: inline; width: auto; vertical-align: inherit;">
  {% assign codes = 'USD,EUR,GBP,CAD,ARS,AUD,BBD,BDT,BSD,BHD,BRL,BOB,BND,BGN,ILS,MMK,KYD,CLP,CNY,COP,CRC,HRK,CZK,DKK,DOP,XCD,EGP,XPF,FJD,GHS,GTQ,GYD,GEL,HKD,HUF,ISK,INR,IDR,NIS,JMD,JPY,JOD,KZT,KES,KWD,LVL,LTL,MXN,MYR,MUR,MDL,MAD,MNT,MZN,ANG,NZD,NGN,NOK,OMR,PKR,PYG,PEN,PHP,PLN,QAR,RON,RUB,SAR,RSD,SCR,SGD,SYP,ZAR,KRW,LKR,SEK,CHF,TWD,THB,TZS,TTD,TRY,UAH,AED,UYU,VEB,VND,ZMK' | split: ',' %}
  {% assign supported_codes = settings.supported_currencies | split: ' ' %}
  <option value="{{ shop.currency }}" selected="selected">{{ shop.currency }}</option>
  {% for code in supported_codes %}
    {% if code != shop.currency and codes contains code %}
    <option value="{{ code }}">{{ code }}</option>
    {% endif %}
  {% endfor %}
  </select>
</label>